Week 3 Challenge

Answer-

Given data-

Length of column = Height of Building L = 10 mtr

effectively restrained in mid height in one direction (in Z direction) but free to move in other direction (Y direction)

Effective Length = 1.2 L =1.2*10 =12 mtr (As per IS 800-2007 Table -11)

Pinned Base with spread footing –

Effective Length = 1 L =1*10 = 10 mtr(As per IS 800-2007 Table -11)

Fixed base spread footing -

Effective Length = 2 L =2*10 = 20 mtr(As per IS 800-2007 Table -11)

Answer-2

Aim- Design Axial strength determination of a column with its end conditions.

Procedure-

1. Calculate of radius of gyration of compound section
2. Check Buckling Class & Slenderness ratio
3. Find Compressive strength from table 9 c.
4. Calculate design strength and axial carrying capacity.

Step by step calculation and check-

Answer-3

Aim- Design circular tube strut member for certain load

Procedure-

1. Calculate required area
2. Choose section from calculated area
3. Check liming and width to thickness ratio
4. Check buckling class and slenderness ratio
5. Find compressive strength from table 9 a
6. Calculate design strength and check.

Step by step calculation and check-

Answer-4

Aim – Design of laced column

Procedure-

1. Calculate required Cross section area
2. Assume a channel section and calculate the compressive capacity
3. Find the appropriate spacing of channel
4. Find spacing of lacings
5. Calculate design forces –Transverse, compressive force in lacing bars
6. Check if the assumed lacings are safe for calculated design forces.
7. Check if effective slenderness ratio is within limit

Calculation step by step and check -

Answer-5

Aim – Design of Battened column

Procedure-

1. Calculate required Cross section area
2. Assume a channel section and calculate the compressive capacity
3. Find the appropriate spacing of channel
4. Find spacing of battened & size of end and intermediate battened.
5. Calculate design forces –Transverse, shear, bending moment
6. Check the assumed Battened are safe for calculated design forces.

Calculation step by step and check-